Chapter 13 The kidneys and urinary tract/Fig 13.21.jpg

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(A) In malignant hypertension more severe and acute vascular changes are seen in the arterioles. (B) This is characterized by fibrin deposition, platelet activation and transmural necrosis of the arteriolar wall, a constellation of features known as fibrinoid necrosis. There is little inflammatory infiltrate in fibrinoid necrosis.